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Actress Annabeth Gish attends the 1st Annual Baby2Baby Gala at The BookBindery on November 3, 2012 in Culver City, California.Photo: David Livingston/Getty Images

Annabeth Gish has been cast as Adam Scott's sister on Parks and Recreation, according to EW. She'll appear later this season when Ben and Leslie visit Ben's former mayoral hometown in Minnesota. Gish played the president's oldest daughter on The West Wing, so by the TV rule of family trees, this means Ben is related to President Josiah Bartlet! (We know: Ben's father on Parks is Breaking Bad's Jonathan Banks. Just go with it.)